[FIX] expression: do not double quote column names
[MERGE] forward port of branch 7.0 up to revid 5270 chs@openerp.com-20140403084524-9rb174osjrbmhgwc
Merge branch 'master' of bzr::lp:~openerp/openobject-server/saas-2 into ocb-saas-2